Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trinh cua » tinh cua, trinh luat, trinh quan
nang cong » nang song, dang cong, bang cong
hang cong » dang cong, hang nong, bang cong
vang van » tang van, lang van, van van
dang van » hoang van, hang va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - hanh trinh cua ((nang cong) or (hang cong)) ((vang van) or (dang van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh trinh cua ((nang cong) OR (hang cong)) ((vang van) OR (dang van)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh trinh cua ((nang cong) or (hang cong)) ((vang van) or (dang van)) ban*.